本文選題：含砂低液限粘土 + 水穩(wěn)定性��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：含砂低液限粘土分布廣泛,成分和性質(zhì)特殊。在修筑高速公路時(shí),廢棄的含砂低液限粘土的處理及填土的來源是一個(gè)棘手的問題,若處理不當(dāng),既造成資源浪費(fèi),又增加了施工成本。本文依托福建省莆永高速公路路基填筑工程,結(jié)合當(dāng)?shù)氐木唧w條件,通過試驗(yàn)及ABAQUS模擬,旨在考慮不同因素影響下含砂低液限粘土路基的受力與變形特性,從而提出優(yōu)化的路基結(jié)構(gòu)形式。本文的主要研究?jī)?nèi)容及結(jié)論如下:(1)通過對(duì)室內(nèi)試驗(yàn)數(shù)據(jù)進(jìn)行分析整理,研究了莆永高速公路沿線含砂低液限粘土的物理力學(xué)性質(zhì),包括:級(jí)配、液塑限、擊實(shí)特性、CBR、抗剪強(qiáng)度、回彈模量等。試驗(yàn)結(jié)果表明:含砂低液限粘土的水穩(wěn)定性極差,在莆永高速公路沿線降雨豐富、地下水位較高的情況下,含砂低液限粘土填筑的路基的穩(wěn)定性及變形特性堪憂。(2)研究了石灰、水泥改良后含砂低液限粘土的CBR、回彈模量等,提出了莆永高速公路沿線含砂低液限粘土采用石灰、水泥改良時(shí)的合理?yè)饺雱┝俊?3)利用ABAQUS軟件,模擬了在設(shè)計(jì)使用年限內(nèi)的交通荷載作用下,不同路基高度、不同下路堤改良層厚度時(shí)路基的受力與變形特性,以瀝青混凝土路面層底容許彎拉應(yīng)力為控制條件,提出了含砂低液限粘土填筑路基時(shí)下路堤的合理改良厚度。(4)利用ABAQUS軟件,研究了地下水毛細(xì)作用及降雨入滲作用對(duì)含砂低液限粘土路基的穩(wěn)定性及變形的影響。結(jié)果表明:地下水毛細(xì)作用對(duì)于高度低于17.5m的路基有不利影響。邊坡降雨入滲對(duì)含砂低液限粘土路基的差異沉降量影響不明顯,但對(duì)邊坡穩(wěn)定性有不利影響。受到路基邊坡雨水滲入的影響,沿著入滲區(qū)和干燥區(qū)的分界面出現(xiàn)滑移面,路基的整體穩(wěn)定性降低。(5)利用ABAQUS軟件,模擬了采用隔斷層、粘土包邊等措施處理后含砂低液限粘土路基的受力與變形特性,提出了潮濕、多雨地區(qū)含砂低液限粘土路基的結(jié)構(gòu)形式。
[Abstract]:Sand-bearing clay with low liquid limit is widely distributed with special composition and properties. In the construction of freeway, the disposal of abandoned low-liquid clay containing sand and the source of filling is a thorny problem. If not treated properly, it will not only cause waste of resources, but also increase the cost of construction. Based on the embankment filling project of Puyong Expressway in Fujian Province, combined with the local specific conditions, through tests and Abaqus simulation, this paper aims to consider the mechanical and deformation characteristics of low-liquid clay subgrade bearing sand under the influence of different factors. Thus, the optimized subgrade structure form is put forward. The main contents and conclusions of this paper are as follows: (1) the physical and mechanical properties of low-liquid clay containing sand along Puyong Expressway are studied through the analysis and collation of laboratory test data, including gradation, liquid-plastic limit, compaction characteristics, CBR, shear strength, etc. Modulus of resilience, etc. The test results show that the water stability of low liquid limit clay containing sand is extremely poor. Under the condition of abundant rainfall and high groundwater level along Puyong Expressway, the stability and deformation characteristics of subgrade filled with low liquid limit clay containing sand are studied. The CBR, springback modulus and so on of low liquid limit clay containing sand after cement improvement are put forward. It is put forward that the sand containing low liquid limit clay along Puyong Expressway is lime, and the reasonable mixing dose of cement is improved by using Abaqus software. Under the action of traffic load in the design service life, the stress and deformation characteristics of the subgrade are simulated under different embankment height and the improved layer thickness of the lower embankment. The allowable bending and tensile stress at the bottom of the asphalt concrete pavement is taken as the control condition. The reasonable improved thickness of embankment under filling embankment with sand and low liquid limit clay is put forward. Using Abaqus software, the effects of groundwater capillary and rainfall infiltration on stability and deformation of embankment with sand and low liquid limit are studied. The results show that the capillary effect of groundwater has a negative effect on the roadbed with height below 17.5m. The effect of rainfall infiltration on the differential settlement of low liquid limit clay subgrade with sand is not obvious, but it has a negative effect on slope stability. Affected by Rain Water infiltration of embankment slope, slip surface appears along the interface between infiltration zone and dry area, and the overall stability of roadbed is reduced. 5) Abaqus software is used to simulate the use of separated fault. The mechanical and deformation characteristics of low liquid limit clay roadbed with sand after treatment with clay-embossed edges are discussed. The structural form of low-liquid clay roadbed with sand in humid and rainy areas is proposed.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U416.1

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王成華;萬(wàn)正義;張成林;;非飽和砂土坡面降雨非正交入滲試驗(yàn)與數(shù)值模擬研究[J];巖土工程學(xué)報(bào);2015年08期

2 范思康;;高速公路含砂低液限粘土路基施工[J];山西建筑;2014年27期

3 蔡靖宇;;高速公路全風(fēng)化花崗巖路基改良試驗(yàn)研究[J];科技信息;2014年05期

4 董柏富;;摻石灰改善濕軟土路基填料的施工技術(shù)探討[J];交通建設(shè)與管理;2013年05期

5 秦林清;;含砂低液限黃土沖溝高填方路基填筑質(zhì)量控制[J];山西建筑;2012年23期

6 馬振洲;孫曉利;;吉林省東部山區(qū)全風(fēng)化花崗巖的工程特性[J];吉林水利;2012年06期

7 程鈺;石名磊;;石灰改性膨脹土擊實(shí)曲線的雙峰特性研究[J];巖土力學(xué);2011年04期

8 劉英;于立宏;;Mohr-Coulomb屈服準(zhǔn)則在巖土工程中的應(yīng)用[J];世界地質(zhì);2010年04期

9 文召利;;張涿高速公路全風(fēng)化花崗巖物理力學(xué)性質(zhì)研究[J];科技傳播;2010年21期

10 高發(fā)亮;商慶森;馬國(guó)梁;;粉土、粘土壓實(shí)與滲透微觀機(jī)理的研究[J];中外公路;2010年03期

相關(guān)會(huì)議論文 前2條

1 徐春明;楊衛(wèi)東;汪春桃;唐善普;孫海軍;;寧淮高速公路馬武段膨脹土特性的認(rèn)識(shí)與建議[A];全國(guó)公路工程地質(zhì)科技情報(bào)網(wǎng)2006年技術(shù)交流會(huì)論文集[C];2006年

2 王景龍;王哲;;飽和粉質(zhì)粘土在不同固結(jié)條件下受載后孔壓變化試驗(yàn)研究[A];第十一屆全國(guó)結(jié)構(gòu)工程學(xué)術(shù)會(huì)議論文集第Ⅱ卷[C];2002年

相關(guān)博士學(xué)位論文 前2條

1 肖軍華;提速列車荷載下粉土的力學(xué)響應(yīng)與路基穩(wěn)定性研究[D];北京交通大學(xué);2008年

2 賀建清;石灰改良土路基填料的動(dòng)力特性及應(yīng)用研究[D];中南大學(xué);2005年

相關(guān)碩士學(xué)位論文 前6條

1 劉東明;全風(fēng)化花崗巖粉砂質(zhì)土改良特性及道路變形研究[D];北京交通大學(xué);2016年

2 楊?yuàn)櫮?東南沿海地區(qū)地質(zhì)災(zāi)害易發(fā)性評(píng)價(jià)方法研究[D];北京交通大學(xué);2016年

3 范植昱;荷載和溫度對(duì)瀝青路面Top-Down開裂影響的有限元分析[D];長(zhǎng)沙理工大學(xué);2011年

4 樊波波;清伊高速公路改良粉粘土路基施工技術(shù)研究[D];長(zhǎng)安大學(xué);2010年

5 劉祖富;海南東環(huán)鐵路全風(fēng)化花崗巖路基填料改良研究[D];西南交通大學(xué);2009年

6 趙紅;低液限粘土路堤修筑技術(shù)研究[D];長(zhǎng)安大學(xué);2005年

，

本文編號(hào)：2035309